What are the best food to eat while building endurance?

I am currently trying to build up my stamina or endurance on running and i was wondering what would be the best food i can eat to help me gain or stablize my body I am currently not the fit i could barely run a full mile and trying to get to a challenge of 3 miles in 1 month or so probably a little bit more. Tips about gaining stamind and endurance would be great if u want =

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